Smart Irrigation System using soil moisture sensor and DHT22

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Smart Irrigation System using soil moisture sensor and DHT22

The EzloPi smart devices provide automation through simple, customizable use with our open-source EzloPi platform, making daily life easier and improving human-machine interactions.

Before moving into this example, it is very important to know about the device registration, provisioning and converting the ESP32 device into an EzloPi device along with knowledge of Web Flasher, MiOS Mobile Application for Android/iOS and the MiOS Web Application.

1. About this example

The smart irrigation system project leverages a soil moisture sensor and DHT22 sensor integrated with the EzloPi device to automate and optimize watering conditions for plants or crops. The soil moisture sensor monitors the water content in the soil, while the DHT22 provides real-time temperature and humidity data. Based on these readings, the EzloPi device can be programmed to trigger water pumps or sprinklers when necessary, ensuring efficient water usage. The system aims to conserve resources and promote healthier plant growth by preventing over or under-watering, making it ideal for gardens or agricultural applications.

3. Circuit Diagram & Interface

The following components are required for interfacing with the EzloPi device:

ESP32 as an EzloPi smart device.
Capacitive soil moisture sensor.
DHT22 digital temperature and humidity sensor.
LED with 100 Ohm Resistor

MH-FMD BuzzerThe wiring diagram of ESP32 30 pin is represented as follows:

The following connections are made in order to complete the circuit setup.

From ESP32 to Soil Moisture Sensor:

ESP32	Soil Moisture Sensor
VIN	VCC
GND	GND
D4	A (Data Signal)

From ESP32 to DHT22:

ESP32	DHT22
3V3	VCC
GND	GND
D13	Data Signal

From ESP32 to LED & Resistor:

ESP32	LED	Resistor
GND	Cathode	-
-	Anode	Terminal no.1
D13	-	Terminal no.2

4. Interfacing the Soil moisture sensor and DHT22 with the EzloPi Web Flasher

1. Set up your device/hardware by visiting config.ezlopi.com

Now, click on the Connect Device button and a pop-up window will appear.

Now, select COM Port to which your ESP32 device is connected. In our case, the COM3 port is used.

Click Connect

If you are new to this and it's your first time configuring, select Create new Device ID. Enter Wifi SSID and Wifi Password.
In the Device Configuration, tab click on Analog Input.

An Analog Input window will open for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to Soil Moisture Sensor.
Set Device Subtype to Soil Moisture Sensor.
Set the ADC input pin to 15.
Set the Resolution to 10-bit.
Then Click Apply Button.

In the Device Configuration, tab click on One Wire.

A pop up window will open for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to DHT22.
Set the GPIO to 4.
Set Device subtype to DHT22.
Then Click Apply Button.

In the Device Configuration, tab click on Digital Output.

A window will be opened for inputting the following parameters:

Set a Device Name of your choosing. In our case, we will set it to LED.
Set the Device Subtype to LED.
Set OUT GPIO to 13.
Set the Resistor to PULL UP.
Then Click Apply Button.
After clicking the apply button you can see a table of your setting in the device configuration tab.
Press the Flash Device button.

A window will appear on the bottom right side of the screen displaying “Please press BOOT button while flashing begins.”

Hold the BOOT button down until the next window appears on the bottom right side of the screen which says “Installation prepared. Please release the boot button now.”

Release the BOOT button from your ESP32 when this pop-up on the bottom right window appears.

After some time, a popup will appear saying Device Flashed Successfully! This means that your device has been set up successfully.

5. MiOS Web Dashboard

After configuring the controller with the EzloPi web flasher, head to ezlogic.mios.com

Use the same credential to log in that you used for configuring the controller with the web flasher.

Here, on the MiOS web dashboard, you will be able to see the tiles of connected devices. In our case, we have a soil moisture sensor, DHT22 and LED tiles. The soil moisture sensor shows the moisture in the soil. The LED will be operated according to our setting of meshbot. We can also use motors instead of LED to pump/provide water to soil. The DHT22 tile shows the temperature and humidity of the environment using the sensor.

MeshBots:

On the left side of the screen under Automation, click on MeshBots.
On meshbot screen, click on Create new MeshBot button present on the top right corner of the screen.
After clicking on Create new MeshBot, you will see this now under Automation MeshBot click on Local.

On the next screen you will see that we can create a name of our choosing, in this case we write it as Test002.

In the trigger tab you can set the TRIGGER for your device and in the ACTION tab you can set the action to be performed based on the trigger which you have created.

Set these things in TRIGGER section:

Set Node Type to Device.
Set the Node to Soil Mositure Sensor.
Set the Category to parent_abstract.
Set the variables to uuid.
Set the Comparator to Less (<).
Set the Value Type to value.
Set the value to 20.

Set these values in the TRUE part of the ACTION section.

Set Controllable Type to Device.
Set the Controllable to LED.
Set the Capability to switch.
Set the Value to true.
Set Action to immediately.

Set these values in the FALSE part of the ACTION section.

Set Controllable Type to Device.
Set the Controllable to LED.
Set the Capability to switch.
Set the Value to false.
Set Action to immediately.
Now Click the Save button.

After clicking the save button you can see this screen on the top right corner of the screen.

Here you can see your saved MeshBot. Now click on Dashboard.

Now in the MiOS web dashboard, we can see that when the soil moisture reaches a certain value as declared above, the LED will turn ON because of the rules we have set in meshbot.

6. MiOS App

You can download the MIOS Android app from the Google Play Store and Apple App Store.

After downloading the app, proceed to install the application and open it.

Using the MIOS mobile application, create a new Ezlo Cloud account using the sign-up option. If you already have an account, you may proceed to log in.

After successfully logging in, you will be able to see the number of controllers connected such as a lamp, fan, or any other device in the MiOS app. Tap on any controller of your desired ID:

You will be able to see the status of your controller whether it is online or offline. Access the device dashboard, and tap the device. The following view of the dashboard will appear:

Here, on the MiOS mobile dashboard, you will be able to see the tiles of connected devices. In our case, we have a soil moisture sensor, DHT22 and LED tiles. The soil moisture sensor shows the moisture in the soil. The LED will be operated according to our setting of meshbot. We can also use motors instead of LED to pump/provide water to soil. The DHT22 tile shows the temperature and humidity of the environment using the sensor.

Now in the MiOS mobile dashboard, we can see that when the soil moisture reaches a certain value as declared above while configuring the meshbot, the LED will turn ON because of the rules we have set in the meshbot.